The RAMPS 1.6 is the second RAMPS iteration released by BIQU/BIGTREETECH. It replaces the original green power connector with a pair of screw terminals, adds a larger heatsink over the MOSFETS, and has a larger bed MOSFET. It maintains the surface-mounted fuses and flush MOSFETS of the RAMPS 1.5.

IMPORTANT:
It is important to note that the RAMPS 1.6 is not developed by UltiMachine, the original developer of the RAMPS boards. It is designed and manufactured by BIQU/BIGTREETECH based on the original open-source RAMPS designs but they have not open-sourced the designs or released any official documentation to date which is in violation of the original RAMPS hardware license.

Also, the positions of the D1 and D2 diodes have been swapped from the positions in RAMPS 1.4, the D1 diode is now the diode closest to fuse F2. The same is true for RAMPS 1.5, also manufactured by BIQU/BIGTREETECH.